That is kind of simplistic. Fangraphs value is EXTREMELY context dependent - and heck, it varies during the season.
Tampa's dollar per WAR is very low - though it can jump up if it is high enough. (tl;dr - Tampa has to pile up a lot of wins before anybody gives enough of a crap for them to move the needle financially)
Boston's is higher.
At the same time, the teams' own "replacement" is not the hypothetical R of WAR - but what they actually expect to be able to sign for the position. I mean, a "replacement player" is basically an "up and down" guy. Basically Bryce Brentz (for an outfielder).